The Obama administration said Tuesday that 11.7 million Americans now have private health insurance through federal and state marketplaces, with 86 percent of them receiving financial assistance from the federal government to help pay premiums.

About three-fourths of people with marketplace coverage — 8.8 million consumers — live in the 37 states served by HealthCare.gov, the website for the federal insurance exchange. The other 2.9 million people are in states that created and operate their own exchanges.